- Correspondence to Polina Putrik, Department of Health Promotion and Education, Maastricht University, School for Public Health and Primary Care (CAPHRI), Peter Debyeplein 1, Maastricht 6229HA, The Netherlands;
- Received April 21, 2013
- Revised June 10, 2013
- Accepted July 14, 2013
- First published August 12, 2013.
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